Fluid-pressure engine.



No. 702,488. Patented lune l7, I902.

R. cQsAYER. FLUID PRESSURE ENGINE.

(Application'filed Ap r. 20, 1900.) (No Modal.) 2Sheets-Sheet l.

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n4: NORRIS VEYERS co. PHOTO-LUNG" WASHINGTON. u. c.

No. 702,488. Patented lune- I7, 1902.

. R. C.SAYER.

FLUID PRESSURE ENGINE.

(Appliation filed Apr. 20, 1900.)

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UNITED TA ES PATENT Genres.

ROBERT COOKE SAYER, OF BRISTOL, ENGLAND.

FLUID-PRESSURE ENGINE.

SPECIFICATION forming part of Letters Patent No."702,488, dated June 17, 1902.

Application filed April 2o, 1900.

hereby declare the following to be a full, clear,-

andexact description of the invention,such as will enable others skilled in the art to which it appertains to make and use thetsame.

This invention has for its object to work.

the pistons of pressure-engines with 'pressure cut-oil to expand at any point of'its stroke by valves actuated by its own pressure.

In the accompanying two sheets-of illustrative drawings, Figure 1 is a sectional plan at a b c d on Fig. 2; Fig. 2, an elevation at ef on Fig. 1; Fig. 3, a section at g hon Figs. 1 and 4; Fig. 4, a section atj k on Fig. 3; Fig. 5, a section at Z 'm on Fig. 4; Fig. 6, in p art,.a section at 'n 0 on Fig. 1; Fig. 7, an elevation of valve-levers at p q on Fig. 1.

The cylinder 1 is provided at each end with a main supply-valve 5 and pipe Sand main exhaust-valve 10 and pipe 12: Itis also provided with two valve-cylinders 68, extendin g the whole length and communicating with the main cylinder 1 by the longitudinal grooves 70 and with the valve-cylinders 21 by the grooves 46 and ports 16. valve-cylinder 68 is a hollow valve 50, having ports 52 53 54 55 or more, arranged helically around the valve, so that as the valve is rotated its interior is successively put into,

communication with the groove 70 at differ-. ent parts of its length, while one port always puts it into communication with the groove 46, and thus with one end of the valve-cylinder 21. The piston 2 is provided with side extensions 200, that extend to and slide over the valve 50. As the piston makes its stroke the extension 200 passes that port in communication'with the groove 7 O, and steam is admittedtto the hollow valve, and thus to the valve-cylinder 21, to cut off the supply. The valve is also arranged to slide longitudinally to still further vary the point of cut-off. Each valve-cylinder 21 is provided with a Working in each.

Serial No. 13,659. (No model.)

central exhaust-port 17 and with a port 15, situated at the opposite end to the port 16 and communicating with the main cylinder by the passage 34 and port 33,situated at such a distancefrom the endlof the cylinder to allow the pressure admitted when it is uncovered to effect the necessary motions to reverse the direction of stroke. The piston 20 of each valve-cylinder 21 is directly connected'to one mainsnpply-valve 5 and by slotted connections 30 to both exhaust valves, so th'at'when the piston 20 is operated by pressure from the port 33 the exhaust-valve at one end is closed,the supply-valve at the same end is opened, the exhaust-valve at the other end is opened, and the passage from the port 33 is closed. When the piston 20 is operated in the other direction from the cut-0d port 52, 53, 54, or 55, the supplyis closed and. the passage from the port 33 is opened- Slidevalves 36, that open and close the passages 34, are operated from the pistons 20.

- Each piston 20 is connected by a rod 23 to a cross-head 25, directly connected by adj ustable links 27 to a lever 47 on the main sup ply-valve 5, here shown as a vibrating plug- 42, centering at 43, and link 41 and rod 40 to the valve 36. v

The valves 50 are connected to be rotated simultaneously by worm-wheels 71, worms 72, shafts 73, chain-gearing 76, connecting the shafts 73, and hand-wheel 77. The valves 50 are arranged to be slid longitudinally together from thehandle-whee167, Fig. 1, on a screwedshafmnuts 66, working on the screws, arms 65, shafts 64, arms 63, links 62, levers 59, and cross-heads 58, -fixed on the, valvespindles 57.

The working is as follows Supposing the parts to be in the position shown -in Fig. 3, the upper supply-valve and the lower exhaust open, the piston 2.descends,, and when it has descended below the port 52 the pressure enters the right-hand valve 50'and by ports 54 and 16, the upper end of the cylinder 21.

The cross-head 25 The piston 20 is forced to descend and lowers the cross-head 25. The cross-head 25 closes the supply-valve 5 at the top of the cylinder, the slotted link 26 not operating the exhaustvalves, and the slide 36 opens the passage for the port 33 on the right-hand side. WVhen the piston descends below the port 33 on the left-hand side, the piston 20 on that side is lowered and lowers its cross-head 25, and thus closes the lower exhaust-valve and opens the upper exhaust-valve and then opens the main supply-valve and closes the passage leading from the port 33 on the right-hand side.

The link 78 is provided with right and left hand screws working in nuts '79, pivoted to the exhaust-valve levers 29, so that by turning the handle 80 both exhaustvalves can be closed. The cylinder 1 is also provided at its ends with air-inlet valves 88. To stop the engine, both exhaust-valves are closed, air being drawn in through the valves 88 and compressed.

The engine will run in either direction, and in order to start it in the required direction levers 31 are attached to the supply-valves 5, and the proper valve 5 can be operated by means of the hand-lever 85, connected by links 84 to the rod 83, provided with stops 81 2 and spring 87.

\Vhat I claim, and desire to secure by Letters Patent, is-

l. A main cylinder provided with longitudinal slots, a piston with extensions working in the slots, main supply and exhaust valves, valve-cylinders extending the length of the cylinder and communicating with the slots, valves in the valve-cylinders having helicallyarranged ports, valve operating cylinders communicating with the valve-cylinder and with the main cylind er, supplementary valves controlling the communications between the valve-operating cylinders and the main cylinder, pistons in the valve-operating cylinders and mechanisms for connecting the pistons in the valve-operating cylinders to the main supply and exhaust valves and the supplementary valves, substantially as described.

2. In an engine in which the cut-off is determined by the position of a port opening into the cylinder, a cylinder having a longitudinal slot, a valve-cylinder extending the length of the cylinder and communicating with the slot, a valve in the valve-cylinder having helically-arranged ports, and mechanism for rotating the valve to bring the required port in communication with the slot, substantially as described.

3. In an engine in which the cut-off is determined by the position of a port opening into the cylinder, a cylinder having a longitudinal slot, a valve-cylinder extending the length of the cylinder and communicating with the slot, a valve in the valve-cylinder having helically-arranged ports, and n1echanism for sliding the valve in the valve-cylinder substantially as described.

4. A main cylinder provided with a port situated so that the piston passes it at the desired point of cut-01f, a valve-operating cylinder communicating at one end by a passage with the cut-off port, and at the other end by another passage with a port situated so that the piston passes it near the end of itsstroke, a valve in this second passage, a piston in the valve-operating cylinder, main supply and exhaust valves and mechanism connecting the valve-operating piston with the valves, substantially as described.

In testimony whereof I have aflixed my signature in presence of two witnesses.

ROBERT COOKIE SAYER.

lVitnesses:

LIONEL A. VViLsoN, CHARLES E. RICKETTS. 

